In 1993, the magnificent Renaissance Bridge of Mostar collapsed under the blows of the fratricidal war in the former Yugoslavia. Today, finally, we are thinking about reconstruction. A group of Italians has been awarded the task of designing the rebirth of the bridge as it was before the destruction, with its characteristic "humpback" shape. Marco Visalberghi shows us the difficulties and prospects of a long-awaited project. The predators of the seas: orcas. These carnivorous cetaceans that reach six tons in size, even feed on large whales and represent a personification of a sea "monster".